<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
    <form action="__SELF__" method="post" enctype="multipart/form-data">
        收件人邮箱：<input  type="text" name="mail"/>
        标题：<input  type="text" name="title"/>
        内容<input  type="text" name="content"/>
        <input class="button" type="submit" value="发送"/>
    </form>
</body>
</html>